How to Say "snot-nosed kid" in Spanish
The Spanish word for “snot-nosed kid” is “mocoso” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
nounB1informal
informal way to describe someone young and inexperienced

Examples
Ese mocoso me robó el asiento en el autobús.
That brat stole my seat on the bus.
No voy a dejar que un mocoso me diga qué hacer.
I'm not going to let some snot-nosed kid tell me what to do.
Using adjectives as nouns
In Spanish, words that describe things (adjectives) can easily become nouns just by adding 'the' (el/un) in front of them. 'Mocoso' literally means 'snotty,' but here it means 'a snotty person.'
Don't use with your boss
Mistake: “Calling a younger coworker 'mocoso' in a meeting.”
Correction: Use 'joven' or their name; 'mocoso' is usually seen as an insult or a very aggressive way to call someone immature.
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